xcircuit: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/xcircuit - from package: xcircuit

You may install the required package with command apt-get install {package}

Error in other languages:
xcircuit: bevel nie gevind nie
xcircuit: comandă negăsită
xcircuit: comando não encontrado
xcircuit: commande introuvable
xcircuit: command not found
xcircuit: käsku ei ole
xcircuit: không tìm thấy lệnh
xcircuit: komanda nerasta
xcircuit: Kommando nicht gefunden.
xcircuit: kommandot finns inte
xcircuit: komut yok
xcircuit: nie znaleziono polecenia
xcircuit: níor aimsíodh an t-ordú
xcircuit: no se encontró la orden
xcircuit: no s'ha trobat l'ordre
xcircuit: opdracht niet gevonden
xcircuit: parancs nem található
xcircuit: perintah tidak ditemukan
xcircuit: príkaz nenájdený
xcircuit: příkaz nenalezen
xcircuit: команда не найдена
xcircuit: командата не е открита
xcircuit: 命令找不到
xcircuit: コマンドが見つかりません